Can anyone help with this? My nephew is nearly seven and is currently chewing everything in sight; cuffs, sleeves, school jumpers, duvets and most recently his brand new bed. My sister is really concerned that he may have some underlying worry that he's not discussing, but he seems a laid back and easy going little boy who wouldn't appear to have concerns. Does anyone have any similar experiences or any advice which you could share with her? Thanks in advance.